Chemical Change
Physical Change
Expanding/ Contracting
Conductors/ Insulators
Ecosystems
100
Which one is not a chemical change? Gas is created, Heat increases, Something is Chopped.
Something is chopped
100
Which one is not a physical change?
Using food coloring, Heating something up with fire, Boiling water, Gas bubbles are formed from mixing two substances.
Gas bubbles are formed from mixing two substances
100
Why should Ann leave space at the top of her plastic bottle when filling with water and then freezing it overnight?
A
Water expands when frozen, so the water will need more space.
B
Water contracts when frozen, so the water will need more space.
C
Plastic contracts when frozen, so the water will need more space.
D
Plastic expands when frozen, so the water will need more space.
A
100
Many electrical wires are wrapped with a plastic coating because plastic is
less expensive than steel
more dense than copper
able to keep its shape
a good insulator
4. a good insulator
100
Why are salt marshes and estuaries important for ocean life?
They minimize damage to oceans during hurricanes
They filter salt out of river water before it enters the oceans
They provide safe, nutrient-rich breeding areas for ocean organisms
They increase the amount of sediment able to settle on the ocean floor
They provide safe, nutrient-rich breeding areas for ocean organisms
200
What chemical change can be a physical change to? Color change, Gas created, or Something Rotting.
Color change
200
Which one is a physical change?
Melting ice, Chopping wood, Breaking glass, Dissolving sugar in water.
All of them
200
Which best explains why there are gaps between the concrete sidewalks?
A
When temperatures get cold, the gaps allow the concrete to expand without cracking.
B
When temperatures get hot, the gaps allow the concrete to expand without cracking.
C
When temperatures get cold, the gaps allow the concrete to contract without cracking.
D
When temperatures get hot, the gaps allow the concrete to contract without cracking.
B
200
A spoon is placed into a mug of hot coffee. As the spoon sits in the coffee it begins to get warm. The heat from the coffee moves to the cool spoon. The spoon is an example of a(n) __________________.
conductor (conduction)
200
Which best describes a difference between estuaries and ponds?
Ponds flow into the ocean and estuaries do not.
Ponds are affected by tides and estuaries are not
Ponds have salt water and estuaries have brackish water
Ponds are freshwater and estuaries are brackish water
Ponds are freshwater and estuaries are brackish water
300
Chris is burning wood in a bonfire. What change is occurring during the fire?
The wood is gaining more mass
The wood is changing into a liquid
The wood is dissolving into the ground
The wood is releasing a gas as smoke
The wood is releasing a gas as smoke
300
What is a physical change?
When only the physical properties of something changes without changing the chemical properties.
300
Popcorn is made from corn kernels. What occurs when kernels are heated in a microwave?
A
The kernels expand.
B
The kernels dissolve.
C
The kernels become hard and brittle.
D
The kernels stick together to form a ball.
A
300
Ms. Smith uses her lunch box to keep her lunch warm. The lunchbox is an example of a(n) ______________________.
insulator
300
Which characteristics differs the most between a forest and a grassland ecosystem?
1. The amount of salt
2. The amount of trees
3. The amount of sunlight
4. The amount of organisms
The amount of trees
400
Jamie is observing an ice cube in a bowl. Which statement describes the change that Jamie will most likely observe?
Jamie will observe a liquid changing into a solid
Jamie will observe a solid changing to a liquid
Jamie will observe a liquid changing to a gas
Jamie will observe a solid changing to a gas
Jamie will observe a solid changing to a liquid
400
Is freezing water a chemical or physical change?
Yes it is a physical change
400
Manuel was having trouble opening a new glass jar of pickles. His father told Manuel to hold the metal lid of the jar under running hot water for a few seconds, then try again. Then the lid opened easily. What is the most likely reason Manuel’s father suggested using hot water to loosen the lid?
A
Glass contracts when it is heated.
B
Metals expand when they are heated.
C
Metals are easier to grip when they are warm.
D
Hot water reduces friction between metal and glass.
B
400
The power goes out at your house and is out for 2 hours! After 2 hours you go to your freezer to check if everything is melted. You notice that everything is still completely frozen. Why did none of the food melt when there was no power to keep the freezer cool?
The food has a low melting point
The food has a high melting point.
The freezer is made of material that insulates and keeps the freezer cold
The freezer is made of materials that conducts and keeps the freezer cold.
The freezer is made of material that insulates and keeps the freezer cold
400
In which two ecosystems would you find rattlesnakes, deer, and rabbits?
1. Forest and ocean
2. Ocean and estuary
3. Grassland and forest
4. Estuary and grassland
Grassland and forest
500
Which property of sugar remains after sugar is dissolved in water?
Color
Taste
Shape
Texture
Taste
500
Is a popsicle melting a physical change?
Yes
500
Why would a balloon expand over heat, as seen in lesson 14?
Gases expand when heated and take up more space
500
You are on a camping trip and need to make dinner. You forgot your cooking supplies at home. What would be the best way to cook your food?
Shining a flashlight over the food
Food on top of a metal shovel over an open flame
Food in a bucket placed in the sun
Food wrapped up in a sleeping bag
Food on top of a metal shovel over an open flame
500
Which correctly describes rainforest and deserts?
1. They are aquatic because they have a lot of precipitation
2. They are terrestrial because they have little precipitation
3. They are aquatic because they are bodies of water
4. They are terrestrial because they are on land.
They are terrestrial because they are on land.